This secluded walking trail is a hidden gem of a Pittsburgh park.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

A daily replay of the experiment that proved the rotation of the Earth.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

A field of nothing but boulders which resembles a giant's gravel driveway.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

The ruined remains of a coal mining ghost town are hidden within the woods.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

A local prank turned town icon.

It would take 35 firetrucks to fill this enormous glacial pothole.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

America's first serial killer rests in anonymity.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Pennsylvania's own Roswell-style UFO mystery.